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C. trapezoid. D. isosceles trapezoid. The shape above has exactly one pair of parallel sides, so you can rule out parallelogram and kite as possible classifications. The shape is definitely a trapezoid because of the one pair of parallel sides. For a shape to be an isosceles trapezoid, the other sides must be congruent.
Artzy proves these propositions about quadrilateral shapes: 1  If p = ( 1 â q ) â 1 , {\displaystyle p=(1-q)^{-1},} then the quadrilateral is a parallelogram. 2  If a parallelogram has |arg p| = |arg q|, then it is a rhombus. 3  When p = 1 + i and q = (1 + i)/2, then the quadrilateral is square.